Which version is correct?
something is not implemented
or:
something not implemented
It describes the situation of missed feature in software
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Sign up to join this communityWhich version is correct?
something is not implemented
or:
something not implemented
It describes the situation of missed feature in software
Building off @TRomano's comment: Both the short form or the long form can be used depending on context. If you are writing software and generating an error message or throwing an exception, the shorter form is acceptable. The 'to be' verb is usually dropped to keep the messages shorter.
In a more formal situation, such as if you were explaining in an email to a customer that the feature is not implemented, you would use the long form.